Mask for photographic-printing frames



- sept. 14 1926. 1,599,773

W. KBLER KASK FOR PHOTOGRAPHIC PRINTING' FRAMES Filed Feb. 3". 1925 Iwav'roR i Patented Sept. 14,V 1926.

UNITED STATES PATENT OFFICE. p

WALTER KBLER, or ztrmcn, swrrzEaLAND.

- MASK FOR PHOTOGBAPHIC-PRINTING FRAMES.

Application flled February 3, 1925, Serial No. 6,671, and in Germany .Tune 18-, 1924.

Masks for photographic printing frames are already known Wherein the mask presents a resilient convexity and is provided on its longitudinal sides with guides for the insertion of the glass plate. These masks have however only a very limited application as an exactly suitable glass plate with longitudinal edges ground round as well as a specially constructed printing frame must be provided.

In order to avoidthis, the mask according to the resent invention has on its longitudinal sides upstanding fillets or angle pieces turned otwardly, so that upon placing in a printing Vframe of known kind it is held fast in consequence of the side pressure of the resilient angle pieces. It suits an ordinary glass plate and the mask can be used for any ordinary frame. With this, damaging of What is underneath, films, plates or the like is obviated as the mask is merely placed on. This mask may be used equally well for films as for plates, which, as in an ordinary printing frame Without masks, can be used completely to the outer edge.

The accompanying drawings show an example of the invention, whereof:

Figure 1 is a plan view; Fig. 2 a front elevation; Fig. 3 a side view; and F ig. 4 a cross section.

Referring to' the drawings, the mask l provided with an opening in the usual manner and made of thin, spring hardened sheet met-al is provided at the end portions of its long sides With outwardly bent fillets or angular tongues 2, at the central portion with extended angular projections 3 constituting finger-pieces for taking hold of the mask. The mask is placed from above into an ordinary printing frame 5 provided With a glass plate 4, on top of the negative, a film or other plate (i already in place. By gently preesing together the angle projections 3 and therewith the fillets 2, the mask ma be inserted, and when released is held fast by the tension of the angle pieces, the extremities of which are out-turned as shown so as to grip the frame. All fear of damaging the negative, papers or other parts is thus obviated.

It is understood that by printing frame is meant a frame for holding a negatve or the like to be masked for printing off, copying, enlarging, or similar photographic operation.

I claim:

A mask for insertion in photographic printing frames consisting of a single piece of sheet material having upstanding resilient fillets with out-turned gripping extremities on both longitudinal edges of said fillets and upstanding resilient finger-pieces eX- tending beyond said fillets, as and for ,the purpose set forth.

WALTER KUBLER. 

